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61  Using Arduino / General Electronics / Re: Remote Tree on: December 19, 2012, 04:29:55 pm
Why not add a motion sensing device that turns the tree on when your in the room? If nobody is there to see it why leave it on?
62  Using Arduino / Microcontrollers / Re: attiny 85, any pointers?/ on: December 19, 2012, 04:16:13 pm
For my situation with the 85, it worked fin because all I need is cs to be a dedicated pin, the rest are multipurposed for other things, and I used it on 8mhz
63  Using Arduino / Microcontrollers / Re: attiny 85, any pointers?/ on: December 19, 2012, 12:34:51 pm
Np, let me know if u figure it out, feels good to know something I made works for other people too lol
64  Using Arduino / Microcontrollers / Re: attiny 85, any pointers?/ on: December 19, 2012, 09:52:26 am
Does anything change when you force the definitions?
65  Using Arduino / Microcontrollers / Re: attiny 85, any pointers?/ on: December 18, 2012, 05:48:22 pm
Just change the core name to whichever yours is, youll find the name within the attiny core itself, I found it I think by pin definitions, then it will automatically recognize it
66  Using Arduino / Microcontrollers / Re: attiny 85, any pointers?/ on: December 18, 2012, 04:19:50 pm
In the library I included a define for the 84, perhaps depending on your method of enabling attiny use on arduino because I based it on the third party source that I used, I believe there are 2-3 different ones, perhaps that's the fault, ill try on an 84 when I get the chance, tho I think someone else said it worked on an 84
67  Using Arduino / General Electronics / Re: A Cautionary Capacitor Tale on: December 16, 2012, 07:57:29 pm
Lol this is quite interesting, thanks for bringing it up, I just designed something and I had to calculate a capacitor for a boostrapping circuit, and now I'm hoping it works since I used a 0805 2.2uf cap, atleast now if I have problems with that ill know where to look, and maybe ill just automatially stack an extra cap on there, because it seems I will definetly have some sort of drop
68  Using Arduino / General Electronics / Re: Sensing negative voltage on: December 16, 2012, 04:16:29 pm
Are you talking about like an analog reading orjust positiveor negative? If the latter then just an optocoupler will work to tell you if you have negative voltage
69  Using Arduino / General Electronics / Re: MOSFET driver external circuit on: December 14, 2012, 06:34:54 pm
The mosfet gate can basically be modeled as a capacitor, the "resistance" of the mosfet depends on the voltage on that capacitor as that voltage changes the internal structure of the mosfet basically
So adding a resistor makes it an RC circuit with a time constant, so to havd the fasting rise time(prefered in most applications) lowering the R in the equation makes it faster, hence why you don't have a resistor, the driver has a low output impedance and why you use short large traces(also because the trace basically makes it an RLC circuit), if you minimize the R&L all you need to focus on is the peak current available to charge the C, so more peak current means a faster charge time, and that ensures the mosfet passes thru its linear or "ohmic" mode as fast as possible, in high frequency situations the switching losses can easily become more than the static losses from the RDS(on) value
70  Using Arduino / General Electronics / Re: MOSFET driver external circuit on: December 14, 2012, 12:51:42 pm
You don't want any gate resistor, you want it to switch as fast as possible to limit losses
71  Using Arduino / Project Guidance / Re: Can I use this MOSFET in my project? on: December 13, 2012, 01:47:51 pm
Actually from my. Experience 1w is probably the safe limit without a heatsink, muc more than that and it will fry itself and burn your fingers
72  Using Arduino / Microcontrollers / Re: attiny 85, any pointers?/ on: December 12, 2012, 07:45:42 am
heres some code that recieves a message and i think replies as ewell as readoff to an lcd, but it is for an uno and doesnt use the attiny85 spi
73  Using Arduino / General Electronics / Re: RFI with standalone atmega328 on: December 11, 2012, 09:09:12 pm
Lol I've never had a problem with rfi, my arch nemesis is static electricity and the atleast 5 ics it has destroyed are maimed costing me alot of time
74  Using Arduino / General Electronics / Re: RFI with standalone atmega328 on: December 11, 2012, 07:45:08 pm
How are your sensors/devices hooked up? Perhaps isolating them with optoisolators as well as the extra  supply decoupling will solve that, if you can't optoisolate perhaps just getting some toiroidal cores and passing your longer wires a few times thru can limit the interference
also not sure how good of an idea but to ground your ckt ground to earth ground may suppress some interference,  just make sure that the supply you are using will not be harmed by that
75  Using Arduino / Microcontrollers / Re: attiny 85, any pointers?/ on: December 11, 2012, 04:28:20 pm
srry for the delay
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